A Gas Fills a Rigid Box at One Atmosphere and 21

A gas fills a rigid box at one atmosphere and 21 ^$\circ$ C.If we increase the temperature to 50 ^$\circ$ C,what is the pressure of the gas in the box?

A) 1.67 atm
B) 2.42 atm
C) 3.35 atm
D) 1.10 atm
E) 2.72 atm